Steam-boiler.



UNTTED y STATES PATENT @Erica EDWARD VARD, OF MAYVILLE, WVISCONSIN.

STEAM-Botnia SPECIFICATION forming part of Letters :Patent No. 721,482,dated February 24, 1903. Applioationifled May 23, 1902. Serial No.108,663. (No model.)

vTo all whom t may concern,.-

Beit known that I, EDWARD WARD, a citizen of the United States, andaresident of Mayville, in the county of Dodge and State of Wisconsin,have invented certain new and useful Improvements in Steam -Boilers, ofwhich the following is a full, clear, and exact description.

My invention relates to improvements in steam-boilers; and it is moreparticularly directed to that part at' the rear known as the arch, whichforms part ofthe return or combustion chamber.

The object of the present invention is the provision of a simple anddurable construction which may be easily removed and replaced, asoccasion may require, without'disturbing the brick of the boiler-settingat the side or rear walls, whereby the rear end of the boiler can beexposed to enable access to be obtained to theboiler or the iiuesthereofl for the purpose of repairing and cleaning the parts.

The improvements also overcome all diiculty of expansion of the partscrowding or displacing the brickwork, and the parts of the improveddevice are joined together ina novel way and so as to dispense withbolts or other equivalent fasteners.

With these ends in view the invention consists of a steam-boilerembodying the novel features of construction and arrangement, which willbe hereinafter fully described and claimed. l

Reference is to be had t0 the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in both the figures.

Figure 1 is a sectional elevation onthe line 1 l in Fig. 2 through therear part of a steamboiler having my improvement applied thereto, andFig. 2 is atransverse sectional elevation taken in the plane of thedotted line 2 2 in Fig. l.

A designates the rear portion of an ordinary return-tlue steam-boiler,which is disposed in the usual way within a boiler-setting, the sideWalls of which areindicated at b and the rear wall at b. The spacebetween the upper rear part of the boiler A and the rear wall b of theboiler-setting is closed by one or a series of arches, (indicated at CC',) the number of arches depending upon the diameter of theboiler. Itwill be understood that the invention may employ a single arch when aboiler of small diameter is used; but the number of arches may beincreased to two, three, or more, as may be required, although I haveonly shown two of the arches C C in Fig. 2.' Each arch consists of ametallic backingc and a facing c', which is made of fire-brick or otherheat-resisting material. In the manufacture of` each arch I prefer toarrange the Vfire-brick facing'c' in a proper curved position and tocast 'the backing c against the rear surface of said fire-brick facing,whereby the metallic backing and said brick facing are united intimatelyand solidly together without the employment of bolts or other suitablefastenings. It is my practice, however, to provide the convex rearsurface of the brick facing with recesses or grooves into which flowsthe molten metal of the metallic backing during the operation of castingsaid backing, thus uniting the facing and the backing by the keys,(indicated at din Fig. l.) The recesses or grooves in the brick facingmay be of dovetailed shape in cross-section in order that the keys maytake a similar shape, and this construction not only binds thefire-brick and the metal backing substantially together, but it enablesme to produce a superior arch at a low cost of manufacture. The metallicbacking of the brick-lined arch is provided with a loop or eye e, whichis adapted to receive the hook e on the lower extremity of a threadedsuspension-bolt E, the latter passing in an upward direction above theboilersetting and betweenl suitable cross-rails f, which are adapted torestupon the boilersetting at the rear part thereof. The space betweenthe rails is spanned by one or more 'bridges F, and on each bridge isadapted to rest a nut e2, which is screwed on the threaded shank of thesuspension-bolt, whereby the Vbolt is ad justably connected to asupporting device located on the top part of the boiler setting.

By employing the arch or arches contemplated by this invention the rearwall b of the boiler-setting need not extend tothe top edges of the sidewalls b, and in Fig. l I have shown' this rear wall as terminating asuitable distance below the top edges of theside walls,

thereby opening the rear end of the boiler setting. I prefer to employ aseat on the rear wall b for the reception of the lower edge of t-he archor arches, and this seat is provided by cutting away or reducing thewidth of the top part of said wall b', thus forming a ledge b2, whichconstitutes the seat just referred to.

Inbapplying my improvements to a boiler it is only necessary to erectthe rear wall b to a height sufcient to extend above the return-lues ofthe boiler A, and the arch 0r arches C C are then placed in position, soas to span the space between the upper rear end of the boiler and thisrear wall b', whereby the arches and the setting cooperate to producethe return or combustion chamber D. The upper front end of each archrests against the solid or unbroken part of the rear fluesheet, saidfront end engaging with the boiler on a line above the return-tubesthereof. The lower rear end of the arch or arches is seated iirmly uponthe ledge or shoulder of the rear wall, and said arches are engaged bythe suspension-bolts E, the latter relieving the boiler and the settingof some of the weight of the arches.

It is evident that the suspension-bolts may be manipulated in order toraise the arches and permit their removal from the furnace, thus openingthe rear portion of said setting and allowing workmen to obtain easyaccess to the rear part of the boiler, whereby the ues or tubes can beeasily cleaned, or any one of the tubes can be taken out of the boilershould occasion demand. The employment of the arches overcomes expansionof the rear part of the boiler, which in ordinary structures issometimes suiicient to displace or crowd out the bricks from the rearwall b. My improvements enable the rear part of the boiler to be openedwith facility and despatch for the performance of necessary work or forinspection of the parts. These improvements may easily be removed andapplied, and they may be manufactured at a low cost. The employment ofthe firebrick as a facing for the metallic back preserves the latterfrom the deteriorating action of the heat and products of combustion,and the arches are Very durable and efficient in service.

Having thus described my invention, I claim as new and desire to secureby Letters Patent" l. The combination with a boiler, and a rear wall, ofan arch spanning the space between the boiler and said wall and providedon its upper convex face with a loop o1' eye, a bridge on theboiler-setting, a suspensionbolt hooked into said loop or eye of thearch, and a nut screwed on the bolt and supported by the bridge toadjustably suspend said arch.

2. The combination with a steam-boiler, and a rear wall, of a series ofarches spanning the space between the wall and the boiler and removableindividually therefrom, and means for separately suspending andadjusting the arches of the series.

3. The combination with a steam-boiler,

vand a rear wall, of bridge-bars in rear of the boiler, asuspension-plate on said bars, an arch resting on the wall and againstthe boiler, a bolt connected to said arch, and means for adj ustablyconnecting said bolt to the suspension-plate.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EDWARD WARD.

Witnesses:

B. J. NORTON, E. G. BENNETT.

